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Juan Castillo possesses 25 years of NFL coaching experience with three other different teams on both sides of the ball, primarily along the offensive line.
In his first season with the Bears in 2020, Castillo navigated an offensive line group that featured six different starting combinations throughout the season and still produced a 1,000-yard rusher in David Montgomery. Montgomery's 1,070 rushing yards ranked fifth in the NFL, and he went on to record three 100-yard performances, including rushing for 146 yards on 30+ carries and scoring two TDs in Week 15 at Minnesota, a feat previously only accomplished by Walter Payton in Bears history. Under Castillo, he developed two first-year players who were both undrafted free agents from Notre Dame in 2019, Sam Mustipher and Alex Bars, into key starters on the line over the last six weeks of the season. Mustipher started seven games at center and Bars started six games at right guard, one at left guard and one at center as both recevied high praises for their efforts. With the Bears offensive line group the same over the last six weeks of the season (Weeks 12-17), Chicago was sixth in the NFL in points per game (30.1) and sixth in rushing yards with 865.
Previously, Castillo served as the offensive line coach and run game coordinator with the Buffalo Bills from 2017-18. Under his watch, the Bills' rushing attack ranked in the top 10 both seasons. Buffalo finished sixth in the NFL and second in the AFC with 126.1 yards per game in 2017 and fifth in the NFL with 124.0 yards per game on the ground in 2018.
Prior to Buffalo he spent four seasons with the Baltimore Ravens, serving as the run game coordinator in 2013 and offensive line coach from 2014-16. In 2015 Castillo guided an offensive line that helped produce a then-franchise-record 4,271 net passing yards and the second-most total net yards (5,749) in team history. In 2014, Castillo led an offensive line that allowed just 19 sacks, the second fewest in team history at the time, ranking behind only Denver (17) that year with the fewest in the NFL. From 2014-15 the Ravens allowed the fewest sacks in the NFL (43). He originally joined the team as a consultant prior to Super Bowl XLVII in January 2013.
As Philadelphia's offensive line coach from 1998-2010, the Eagles made nine postseason appearances and rushed for an average of 1,854 yards and 12 touchdowns per season. In 2010 the Eagles finished first in the NFC and fifth in the NFL with 145.2 yards per game on the ground. During his 13 seasons as the offensive line coach in Philadelphia, five different players earned nine Pro Bowl honors. He finished his Eagles tenure as the team's defensive coordinator in 2011-12. Under his tutelage, Philadelphia's defense led the NFL with 50 sacks in 2011.
Castillo worked with Nagy for five seasons with the Eagles from 2008-12 while Nagy was just beginning his NFL coaching career as an intern, coaching assistant and offensive quality control coach. Castillo also received his NFL coaching start with the Eagles in 1995 when he served as an offensive assistant for two years before coaching tight ends in 1997.
Castillo earned a bachelor's degree in health/kinesiology in 1986 and a master's in education administration in 1990 from Texas A&I (now Texas A&M-Kingsville), where he was a three-year letterman (1978-80) at linebacker for the Javelinas. Following college, Castillo spent two seasons (1984-85) with the USFL's San Antonio Gunslingers as a linebacker before moving to the coaching ranks.
Castillo attended Port Isabel High School in Texas, where he was an all-state linebacker. On July 4, 2009, Port Isabel celebrated "Juan Castillo Day," in which Castillo received a key to the city and in 2015 Castillo was inducted into the Lone Star Conference Hall of Honor, which recognizes outstanding individuals who have brought pride and honor to the conference through their contributions either as an athlete or coach/administrator.
Juan has four sons: Gregory, who played cornerback at the University of Iowa and is currently a scouting coordinator with the Kansas City Chiefs, John, who is currently interning in Washington D.C., Andres, who played football at the University of Delaware and will be paralegal in the fall, and Antonio, who is currently a junior at Lady Bird Johnson High School in San Antonio, Texas and will be a member of the cross country in the fall.